:root {
  --bg: #f6f6f5;
  --surface: #ffffff;
  --surface-soft: #fbfbfa;
  --ink: #111111;
  --muted: #5f5f5f;
  --line: #dddddd;
  --line-strong: #cfcfcf;
  --shadow: 0 14px 34px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.05);
  --radius: 12px;
  --max: 1320px;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 8%, rgba(255,255,255,0.95) 0 18%, transparent 28%),
    linear-gradient(180deg, #f8f8f7 0%, #f4f4f3 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.45;
}

.demo-ribbon {
  position: fixed;
  top: 12px;
  right: 16px;
  z-index: 20;
  padding: 7px 11px;
  border: 1px solid rgba(17,17,17,0.18);
  border-radius: 999px;
  background: rgba(255,255,255,0.88);
  color: #222;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0 6px 18px rgba(0,0,0,0.08);
  backdrop-filter: blur(8px);
}

.site-header {
  height: 88px;
  background: rgba(255,255,255,0.86);
  border-bottom: 1px solid #dedede;
  box-shadow: 0 1px 0 rgba(0,0,0,0.02);
}

.header-inner {
  height: 100%;
  max-width: 1448px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 300px 1fr 300px;
  align-items: center;
  padding: 0 36px;
}

.brand {
  display: inline-flex;
  align-items: center;
  width: 256px;
}

.brand img {
  display: block;
  width: 250px;
  height: auto;
}

.primary-nav {
  display: flex;
  justify-content: flex-start;
  height: 100%;
  margin-left: 10px;
}

.primary-nav a {
  position: relative;
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 18px;
  color: var(--ink);
  text-decoration: none;
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.primary-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 4px;
  background: var(--ink);
}

.page-shell {
  max-width: var(--max);
  margin: 0 auto;
  padding: 52px 28px 0;
}

.hero {
  margin-bottom: 26px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(48px, 5.4vw, 72px);
  line-height: 0.98;
  letter-spacing: -0.06em;
  font-weight: 800;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  font-weight: 420;
}

.notice {
  min-height: 90px;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 20px 22px;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #fefefe 0%, #f8f8f7 100%);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.035);
}

.notice-icon {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
}

.notice-icon img {
  display: block;
  width: 100%;
  height: 100%;
}

.notice-rule {
  width: 1px;
  height: 52px;
  background: #d9d9d9;
}

.notice p {
  margin: 0;
  font-size: 18px;
  color: #393939;
  font-weight: 600;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(410px, 0.9fr);
  gap: 16px;
  align-items: start;
}

.card {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-soft) 100%);
  border: 1px solid #e4e4e4;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0;
  color: #111;
  font-size: 29px;
  line-height: 1.15;
  font-weight: 790;
  letter-spacing: -0.035em;
}

.details-card {
  min-height: 506px;
  padding: 28px 30px 30px;
}

.details-list {
  margin: 20px 0 0;
}

.detail-row {
  display: grid;
  grid-template-columns: 43% 57%;
  min-height: 53px;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.detail-row:last-child { border-bottom: 0; }

.detail-row dt {
  margin: 0;
  color: #181818;
  font-size: 16px;
  font-weight: 760;
}

.detail-row dd {
  margin: 0;
  min-width: 0;
  color: #444;
  font-size: 16px;
  font-weight: 430;
  padding: 7px 8px;
}


.side-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.steps-card {
  padding: 28px 38px 24px;
  min-height: 320px;
}

.steps-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.steps-list li {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 15px;
  align-items: start;
}

.steps-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #e6e6e6;
  color: #222;
  font-size: 15px;
  font-weight: 750;
}

.steps-list p {
  margin: 3px 0 0;
  color: #232323;
  font-size: 16px;
  line-height: 1.35;
}

.security-card {
  min-height: 172px;
  padding: 24px 34px 24px;
}

.security-card ul {
  margin: 14px 0 0;
  padding-left: 20px;
}

.security-card li {
  margin: 7px 0;
  color: #222;
  font-size: 16px;
  line-height: 1.45;
}

.support-strip {
  margin: 30px calc(50% - 50vw) 0;
  min-height: 138px;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 28px calc((100vw - var(--max)) / 2 + 72px);
  color: #fff;
  background: linear-gradient(110deg, #1a1a1a 0%, #111 100%);
}

.support-icon {
  width: 60px;
  height: 60px;
  display: grid;
  place-items: center;
  border: 2px solid rgba(255,255,255,0.84);
  border-radius: 999px;
  color: #fff;
  flex: 0 0 auto;
}

.support-icon svg { width: 34px; height: 34px; }

.support-strip strong {
  display: block;
  font-size: 20px;
  line-height: 1.2;
  margin-bottom: 6px;
}

.support-strip p {
  margin: 0;
  color: rgba(255,255,255,0.84);
  font-size: 16px;
}

@media (max-width: 900px) {
  .demo-ribbon { position: static; border-radius: 0; text-align: center; }
  .site-header { height: auto; }
  .header-inner {
    min-height: 82px;
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    padding: 20px 24px 0;
  }
  .brand { width: 210px; }
  .brand img { width: 205px; }
  .primary-nav { margin-left: 0; min-height: 52px; }
  .primary-nav a { font-size: 18px; }
  .page-shell { padding: 36px 18px 0; }
  .notice { gap: 16px; align-items: flex-start; }
  .notice-rule { display: none; }
  .content-grid { grid-template-columns: 1fr; }
  .detail-row { grid-template-columns: 1fr; padding: 12px 0; gap: 4px; }
  .support-strip { padding: 28px 24px; margin-left: -18px; margin-right: -18px; }
}


@media (max-width: 680px) {
  :root {
    --radius: 10px;
    --shadow: 0 8px 22px rgba(0, 0, 0, 0.075), 0 1px 5px rgba(0, 0, 0, 0.045);
  }

  body {
    background: linear-gradient(180deg, #f8f8f7 0%, #f2f2f1 100%);
    overflow-x: hidden;
  }

  .demo-ribbon {
    position: static;
    width: 100%;
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    box-shadow: none;
    padding: 8px 12px;
    font-size: 10px;
    line-height: 1.25;
    background: #fff;
  }

  .site-header {
    height: 92px;
    background: rgba(255,255,255,0.96);
    position: sticky;
    top: 0;
    z-index: 10;
  }

  .header-inner {
    min-height: 92px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 18px;
    align-items: end;
    padding: 18px 22px 0;
  }

  .brand {
    width: 156px;
    align-self: center;
  }

  .brand img {
    width: 154px;
  }

  .primary-nav {
    height: 56px;
    min-height: 56px;
    justify-content: flex-end;
    align-self: end;
  }

  .primary-nav a {
    height: 56px;
    padding: 0 8px;
    font-size: 14px;
    font-weight: 700;
    white-space: nowrap;
  }

  .primary-nav a.active::after {
    height: 3px;
  }

  .page-shell {
    width: 100%;
    padding: 28px 18px 0;
  }

  .hero {
    margin-bottom: 18px;
  }

  .hero h1 {
    font-size: 42px;
    line-height: 1.05;
    letter-spacing: -0.055em;
    max-width: 390px;
  }

  .hero p {
    font-size: 16px;
    line-height: 1.45;
    max-width: 360px;
  }

  .notice {
    min-height: 92px;
    padding: 18px 16px;
    gap: 14px;
    margin-bottom: 18px;
    align-items: center;
  }

  .notice-icon {
    flex-basis: 38px;
    width: 38px;
    height: 38px;
  }

  .notice-rule {
    display: none;
  }

  .notice p {
    font-size: 14.5px;
    line-height: 1.35;
    font-weight: 650;
  }

  .content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card h2 {
    font-size: 25px;
    letter-spacing: -0.04em;
  }

  .details-card {
    min-height: 0;
    padding: 22px 22px 24px;
  }

  .details-list {
    margin-top: 14px;
  }

  .detail-row {
    grid-template-columns: 45% 55%;
    min-height: 45px;
    padding: 0;
    gap: 0;
  }

  .detail-row dt {
    font-size: 14px;
    line-height: 1.25;
  }

  .detail-row dd {
    font-size: 14px;
    line-height: 1.28;
    padding: 8px 0 8px 8px;
    overflow-wrap: anywhere;
  }

  .side-stack {
    gap: 16px;
  }

  .steps-card {
    min-height: 0;
    padding: 22px 22px 22px;
  }

  .steps-list {
    gap: 14px;
    margin-top: 15px;
  }

  .steps-list li {
    grid-template-columns: 34px 1fr;
    gap: 12px;
  }

  .steps-list span {
    width: 27px;
    height: 27px;
    font-size: 13px;
  }

  .steps-list p {
    margin-top: 2px;
    font-size: 14.5px;
    line-height: 1.35;
  }

  .security-card {
    min-height: 0;
    padding: 22px 22px 22px;
  }

  .security-card ul {
    margin-top: 12px;
    padding-left: 18px;
  }

  .security-card li {
    font-size: 14.5px;
    line-height: 1.45;
    margin: 6px 0;
  }

  .support-strip {
    margin: 22px -18px 0;
    min-height: 104px;
    padding: 22px 24px;
    gap: 17px;
  }

  .support-icon {
    width: 52px;
    height: 52px;
  }

  .support-icon svg {
    width: 29px;
    height: 29px;
  }

  .support-strip strong {
    font-size: 17px;
    margin-bottom: 4px;
  }

  .support-strip p {
    font-size: 14px;
    line-height: 1.35;
  }
}

@media (max-width: 390px) {
  .header-inner {
    padding-left: 16px;
    padding-right: 16px;
    gap: 10px;
  }

  .brand { width: 138px; }
  .brand img { width: 136px; }

  .primary-nav a {
    font-size: 13px;
    padding-left: 6px;
    padding-right: 6px;
  }

  .page-shell {
    padding-left: 14px;
    padding-right: 14px;
  }

  .hero h1 {
    font-size: 37px;
  }

  .detail-row {
    grid-template-columns: 1fr;
    padding: 10px 0;
  }

  .detail-row dd {
    padding: 3px 0 0;
  }

  .support-strip {
    margin-left: -14px;
    margin-right: -14px;
    padding-left: 18px;
    padding-right: 18px;
  }
}


.hero {
  text-align: center;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}

.support-strip {
  justify-content: center;
  text-align: center;
}

.support-link,
.support-link:link,
.support-link:visited,
.support-link:hover,
.support-link:active,
.support-link:focus,
.support-link strong,
.support-link span,
.support-link svg {
  color: #ffffff !important;
  text-decoration: none !important;
}

.support-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  max-width: 760px;
  margin: 0 auto;
  font-family: inherit;
}

.support-link:hover strong {
  text-decoration: underline !important;
}

.support-copy {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.support-copy strong {
  display: block;
  font-size: 20px;
  line-height: 1.2;
  margin-bottom: 6px;
  font-weight: 780;
}

.support-copy span {
  display: block;
  color: rgba(255,255,255,0.84) !important;
  font-size: 16px;
  line-height: 1.45;
}

@media (max-width: 640px) {
  .hero {
    text-align: center;
    max-width: 100%;
  }

  .support-strip {
    justify-content: center;
    text-align: center;
  }

  .support-link {
    flex-direction: column;
    gap: 12px;
  }

  .support-copy strong {
    font-size: 17px;
  }

  .support-copy span {
    font-size: 14px;
  }
}